1,721,194 research outputs found
Thermal decomposition of asbestos and recycling in traditional ceramics
No full textGiven the known carcinogenic effects, its wide occupational exposures and widespread use in the past, asbestos is considered a general health hazard and a priority treatment for pollution prevention. In this context, asbestos can be entirely transformed to a mixture of non hazardous silicate phases throughout a thermal treatment at 1000-1250 degrees C and to a silicate glass at T>1250 degrees C. These products may be recycled for the production of traditional ceramics. In this paper we describe the recycle of thermally treated asbestos containing materials as a raw material for glass ceramics and traditional ceramics. A significant improvement of the technological properties of porcelainised stoneware, obtained by high sintering of unglazed ceramic bodies, is accomplished by the addition of 5 wt% of an asbestos-based glass ceramic. (C) 2000 Elsevier Science Ltd. All rights reserved
Il progetto di valorizzazione del patrimonio culturale e ambientale
No full textIl contributo indaga il ruolo del progetto tecnologico nella valorizzazione del patrimonio culturale e ambientale, sia dal punto di vista teorico, discutendo di un approccio di tipo "evolutivo" al patrimonio, sia dal punto di vista pratico, illustrando l'esperienza di ricerca-azione operata per il rilancio dei due distretti culturali mantovani. Il contributo si conclude con una riflessione sulle ricadute metodologiche ed operative dell'esperienza fatta
Angular momentum effects in Michelson - Morley type experiments
Full text linkThe effect of the angular momentum density of a gravitational source on the times of flight of light rays in an interferometer is analyzed. The calculation is made imagining that the interferometer is at the equator of an axisymmetric steadily rotating gravity source. In order to evaluate the size of the effect in the case of the Earth a weak field approximation for the metric elements is introduced. For laboratory scales and non-geodesic paths the correction due to the angular momentum turns out to be comparable with the sensitivity expected in gravitational waves interferometric detectors, whereas it drops under the threshold of detectability when using free (geodesic) light rays
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Project challenges: sustainable development and urban resilience
Full text linkThe book constitute a broad and articulated reflection on the issues of sustainability and resilience related to the project of enhancement of the environmental and cultural heritage. The contributions collected in the book have been defined within the framework of seminars organized in occasion of the second edition of the Sustainable Development Festival1. The volume involves also a group of students of the PhD course in “Cultural Heritage Conservation and Valorisation” of Politecnico di Milano, which, under the guidance of professors and expert researchers, have conducted a specific study on the theme of resilience and sustainability with reference to their research activity. The publication convincingly supports the thesis that cultural heritage is a resource for sustainable development and, as such, cannot be considered renewable. To support this thesis, the text proposes four focuses: 1_ Architecture, city and territory This part deals with the topic at the architectural, urban and territorial scale, with particular attention to the themes of the Green products for sustainable architectures and the Green economy and the sustainable project. 2_Peri-urban and rural territories This section presents the theme of the enhancement of environmental heritage on a suburban and rural scale, presenting some interesting case studies and ongoing research. 3_Cultural landscapes This part represents an important theoretical reference to the role of culture in the development of a sustainable project and to the equally strategic role of the theme of landscape and its conservation. 4_Research experiences In the latter part of the text, some ongoing research experiences are presented, which define an interesting repertoire of case studies on the theme of enhancing the environmental and cultural heritage
Energia e sviluppo sostenibile: rapporto 2003 su consumi, impatti ambientali, politiche energetiche locali
No full textProfilo energetico ambientale della Provincia di Potenza. Definizione delle possibili linee di politica energetica locale
- …
